Making a new 9 pin plug for an AVO TESTER - UK Vintage Radio Repair and Restoration Discussion Forum

gezza123 · 8th Jun 2014, 10:03 pm

Hello guys.
I was given by a kind member an (AVO Valve Tester) meter part only, so I
have spent some hours in the workshop and made a temp 9pin plug to fit
the socket,this was just to see if I could do it and to see if the meter part
was working after a repair.

I have put a socket on the end to fit in a 6v6gt valve and left A2/D1/D2
floating.

Here are the results, and now I can go ahead and make up a valve holder
box knowing its going to work.
Plug 1 + 2 +3 + 4
and more pictures to follow off test.
cheers gezza123

gezza123 · 8th Jun 2014, 10:06 pm

More pictures of AVO in use with a 6v6 valve.
Gezza123

Radio Wrangler · 8th Jun 2014, 11:06 pm

Because a valve tester biases a valve up to where it has appreciable gain, thee is a high risk of spurious oscillation with coupling between long connection wires.

If you're going to build your own socket panel to go with it, it's a good idea to use ferrite beads rather liberally to tame things.

David

gezza123 · 9th Jun 2014, 3:25 pm

Hi David.
Thanks for your input, I will keep that in mind when I try to build one.

8th Jun 2014, 10:03 pm	#1
gezza123 Heptode Join Date: Mar 2010 Location: Eastham, Wirral, Merseyside, UK. Posts: 788	Making a new 9 pin plug for an AVO TESTER Hello guys. I was given by a kind member an (AVO Valve Tester) meter part only, so I have spent some hours in the workshop and made a temp 9pin plug to fit the socket,this was just to see if I could do it and to see if the meter part was working after a repair. I have put a socket on the end to fit in a 6v6gt valve and left A2/D1/D2 floating. Here are the results, and now I can go ahead and make up a valve holder box knowing its going to work. Plug 1 + 2 +3 + 4 and more pictures to follow off test. cheers gezza123 Attached Thumbnails

8th Jun 2014, 10:06 pm	#2
gezza123 Heptode Join Date: Mar 2010 Location: Eastham, Wirral, Merseyside, UK. Posts: 788	part 2 More pictures of AVO in use with a 6v6 valve. Gezza123 Attached Thumbnails

8th Jun 2014, 11:06 pm	#3
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,869	Re: Making a new 9 pin plug for an AVO TESTER Because a valve tester biases a valve up to where it has appreciable gain, thee is a high risk of spurious oscillation with coupling between long connection wires. If you're going to build your own socket panel to go with it, it's a good idea to use ferrite beads rather liberally to tame things. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

9th Jun 2014, 3:25 pm	#4
gezza123 Heptode Join Date: Mar 2010 Location: Eastham, Wirral, Merseyside, UK. Posts: 788	Re: Making a new 9 pin plug for an AVO TESTER Hi David. Thanks for your input, I will keep that in mind when I try to build one. Last edited by AC/HL; 9th Jun 2014 at 4:13 pm. Reason: Thread split